Cov qauv kev coj ua ntawm cov chaw ntub dej tsuas yog suav nrog lawv cov qauv molecular cov yam ntxwv thiab tshuaj lom neeg muaj pes tsawg leeg.
Cov yam ntxwv yooj yim ntawm cov qauv molecular ntawm cov chaw ntub dej yog tias ib qho kawg ntawm cov molecule muaj ib pab hydrophilic muaj ib qho kawg muaj ib pab hydrophobic (ntu). Cov qauv no ua rau cov qauv ntub dej los ua cov qauv xim nruab nrab ntawm cov kua thiab cov khoom ntom nti, yog li txo cov txheej txheem ntub dej. Tshwj xeeb, cov pab pawg hydrophilic (xws li hydroxyl, etclecing ntawm cov txheej thiab ua rau nws tau yooj yim rau cov kua kom kis tau rau ntawm cov khoom saum npoo av.
Raws li cov qauv tshuaj sib txawv, cov tshuaj tiv thaiv ntub dej tuaj yeem faib ua cov hauv qab no: Xws li siv polyether-organic silicories Hom Tshuaj Anionic: Xws li Ethylene Oxide Adductions, tsuas yog siv nyob rau hauv cov tshuab dej resin. Hom kev nonionic: xws li fluorine polymers, nrog kev ua kom zoo. Tsis tas li ntawd, lub peev xwm ntawm cov neeg sawv cev ntub dej los txo cov khoom siv hluav taws xob zoo nkauj tseem yuav tsum tau txiav txim siab hauv cov ntawv thov kev siv tau. Piv txwv li, cov tshuaj fluorine-muaj cov chaw ntub dej uas tsuas yog txo cov npoo av zoo nkauj, thaum cov khoom siv ntub dej muaj peev xwm txo cov khoom siv hluav taws xob zoo. Yog li ntawd, thaum xaiv tus neeg ntub dej, nws yog qhov tsim nyog los xaiv raws li qhov xwm txheej tshwj xeeb.